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Carbon reservoirs are natural storages of the greenhouse gas, that include large forests, ocean life and even the atmosphere and layers in the Earth’s crust.
The study suggests the presence of so-called “tipping points” in the Earth’s System that can release large amounts of CO2 into the atmosphere, driving the greenhouse effect and temperatures upwards.
The emission of CO2 through the burning of fossil fuels is one of the leading causes of climate change today.
The study’s findings could give scientists a clue how climate change will affect the Earth in the years to come.
Dr Sev Kender from Exeter, who co-authored the study, said: “Greenhouse gasses such as CO2 methane were released to the atmosphere at the start of the PETM in just a few thousand years.
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